Esd Precautions - Ricoh B174 Service Documentation

PRECAUTIONS FOR WHEN ASSEMBLY/DISASSEMBLY
Replace parts very carefully. Remember the location of each cable before
removing parts, in order to reconnect it afterwards. Please perform the steps below
before replacing or disassembling any parts.
1. Check the contents stored in the memory. Either print a copy of stored data or
write down all of the needed information. All the stored information will be
erased when the main board is replaced.
2. Disconnect the power cord before servicing or replacing electrical parts.
3. Remove the printer cable.
4. Use formal parts and same standardized goods when replacing parts. Check
the product name, part code, rated voltage, rated current, operating
temperature, etc.
5. Do not use excessive force when loosening or tightening plastic components.
6. Be careful not to drop small parts or objects in the machine.

ESD PRECAUTIONS

Certain semiconductor devices can be easily damaged by static electricity. Such
components are commonly called "Electro statically Sensitive (ES) Devices", or
ESD's. Examples of typical ESD's are: integrated circuits, some field effect
transistors, and semiconductor "chip" components.
The techniques outlined below should be followed to help reduce the incidence of
component damage caused by static electricity.

CAUTION
Be sure no power is applied to the chassis or circuit, and observe all other
safety precautions.
1. Immediately before handling a semiconductor component or semiconductor-
equipped assembly, drain off any electrostatic charge on your body by touching
a known earth ground. Alternatively, use a commercially available wrist strap
device, which should be removed for your personal safety reasons prior to
applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD's, place the
assembly on a conductive surface, such as aluminum or copper foil, or
conductive foam, to prevent electrostatic charge buildup in the vicinity of the
assembly.
3. Use only a grounded tip soldering iron to solder an ESD's.